In a Black Hole, light traveling outwards towards an event horizon is pulled back by the very strong gravitational field, because of the warping of space-time inside the event horizon, regardless of the lack of a photon mass. This prevents light from ever escaping the Black Hole.
Black holes are rifts in space and time. Along with a MASSIVE gravitational pull, they have a magnetic field as well. Light is a form of radiation, and so are Radio waves. If radio waves are disrupted and distorted my magnets, does it not stand to reason that light is affected in the same manner?